Answer:
Agoraphobia.
Step-by-step explanation:
In this scenario, Liz is a 70-year-old woman who has developed an irrational fear of open, crowded places and avoids leaving her home. This fear began after Liz lost her husband. Therefore, Liz suffers from agoraphobia.
Agoraphobia is a type of anxiety disorder in which an individual has abnormal and persistent fear of open spaces, crowded places or any such situation that might cause them to feel trapped, unable to escape thereby causing them to panic, helpless or feel embarrassed.
Hence, anyone suffering from agoraphobia would detest going to open or crowded places and avoids leaving their house due to irrational fear of being trapped or access to escape is impossible.
Additionally, please note that agoraphobia is a mental condition which has no cure but can only be treated temporarily because it is usually chronic.